This is the 2nd week rollover event so – as a general rule – our GPS chipset suppliers were aware of the issue and had this covered in their test and validation plans for more recent chipset designs. No currently available Simrad products have any known issues with GPS week rollover. In cases where we have found an incompatibility we have issued a software update, when possible. The GPS Week Number field is modulo 1024. The GPS Week Number field is modulo 1024. Since that time, the count has been incremented by 1 each week and broadcast as part of the GPS message. The result of these tests ensure that our customers have the best information available on this issue. Since that time, the count has been incremented by 1 each week, and broadcast as part of the GPS message. Simrad has carried out extensive testing on all current products, all previous generation products and a significant number of legacy products. It is on the 4th August 2019 at 00:00 AM (UTC) that the week number counters rollover will occur. The week number counters for the GPS in the discontinued models below started their week count from the 19 December 1999. In extreme cases position may be affected. 1 GPS week number rollover The week number counter in GPS resets once every 1023 weeks, which is approximately 19.6 years. Typically affected products will still show correct position, but will show incorrect date and time. Inmarsat-C mobile earth station FELCOM12 / FELCOM12-ALC. What is the result of this if my product is affected? 1.List of equipment that may be affected by the GPS week number rollover.
The 1024 week counter ran out and rolled over for the first time on August 21, 1999 The upcoming GPS week rollover event is on April 6th, 2019. However, the field that contains the week number is limited to 1024 weeks, a GPS rollover event occurs when this counter reaches week 1023 and then rolls back to week 0.Ībout every 20 years. The Global Positioning System (GPS) has its own date and time scale based on counting weeks, and seconds within a week.
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